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Progress in non-invasive detection of liver fibrosis 被引量:43
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作者 Chengxi Li Rentao Li Wei Zhang 《Cancer Biology & Medicine》 SCIE CAS CSCD 2018年第2期124-136,共13页
Liver fibrosis is an important pathological precondition for hepatocellular carcinoma.The degree of hepatic fibrosis is positively correlated with liver cancer.Liver fibrosis is a series of pathological and physiologi... Liver fibrosis is an important pathological precondition for hepatocellular carcinoma.The degree of hepatic fibrosis is positively correlated with liver cancer.Liver fibrosis is a series of pathological and physiological process related to liver cell necrosis and degeneration after chronic liver injury,which finally leads to extracellular matrix and collagen deposition.The early detection and precise staging of fibrosis and cirrhosis are very important for early diagnosis and timely initiation of appropriate therapeutic regimens.The risk of severe liver fibrosis finally progressing to liver carcinoma is&gt;50%.It is known that biopsy is the gold standard for the diagnosis and staging of liver fibrosis.However,this method has some limitations,such as the potential for pain,sampling variability,and low patient acceptance.Furthermore,the necessity of obtaining a tissue diagnosis of liver fibrosis still remains controversial.An increasing number of reliable non-invasive approaches are now available that are widely applied in clinical practice,mostly in cases of viral hepatitis,resulting in a significantly decreased need for liver biopsy.In fact,the noninvasive detection and evaluation of liver cirrhosis now has good accuracy due to current serum markers,ultrasound imaging,and magnetic resonance imaging quantification techniques.A prominent advantage of the non-invasive detection and assessment of liver fibrosis is that liver fibrosis can be monitored repeatedly and easily in the same patient.Serum biomarkers have the advantages of high applicability(〉95%)and good reproducibility.However,their results can be influenced by different patient conditions because none of these markers are liver-specific.The most promising techniques appear to be transient elastography and magnetic resonance elastography because they provide reliable results for the detection of fibrosis in the advanced stages,and future developments promise to increase the reliability and accuracy of the staging of hepatic fibrosis.This article aims to describe the recent progress in the development of non-invasive assessment methods for the staging of liver fibrosis,with a special emphasize on computer-aided quantitative and deep learning methods. 展开更多
关键词 Liver fibrosis non-invasive detection computer-aided quantitative deep learning
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不同核酸提取方法对HBV-DNA检测性能验证情况分析 被引量:1
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作者 周文娟 林真 徐建萍 《现代医药卫生》 2024年第4期575-580,共6页
目的评估2种乙型肝炎病毒(HBV)-DNA提取方法及2家检测试剂的性能,有助于选择优化提取试剂和检测试剂。方法2023年4月采用达安全自动核酸提取仪提取法(磁珠法)和手工提取法(一步法),并用达安和圣湘2种HBV-DNA试剂检测,对其进行精密度、... 目的评估2种乙型肝炎病毒(HBV)-DNA提取方法及2家检测试剂的性能,有助于选择优化提取试剂和检测试剂。方法2023年4月采用达安全自动核酸提取仪提取法(磁珠法)和手工提取法(一步法),并用达安和圣湘2种HBV-DNA试剂检测,对其进行精密度、正确度、线性范围、检出限及抗干扰能力等性能进行验证和评价。结果达安全自动核酸提取仪提取达安试剂检测、手工提取达安试剂检测和手工提取圣湘试剂检测在精密度、正确度、线性范围、检出限方面验证结果均达标;达安全自动核酸提取仪提取圣湘试剂检测在低值检测中变异系数大于5%,最低检测限验证不合格;抗干扰能力方面,全自动核酸提取仪提取的2.0 g/dL血红蛋白浓度的样本用达安和圣湘试剂检测结果均不受影响。手工提取甘油三酯浓度达3000 mg/dL的样本用达安和圣湘试剂检测的结果均不受影响。结论不同厂家的提取和检测试剂避免混用,达安和圣湘试剂对HBV-DNA定量检测的结果均符合要求。 展开更多
关键词 乙型肝炎病毒-dna定量检测 全自动核酸提取仪法 手工提取法 性能验证
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血清CYFRA21-1、CA125联合HPV DNA检测在宫颈癌早期筛查中的价值及病理特征研究
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作者 李彦英 黄平 +3 位作者 张玲 苏梦亚 李玲玲 张纪妍 《分子诊断与治疗杂志》 2024年第4期700-703,708,共5页
目的分析血清细胞角蛋白19片段(CYFRA21-1)、糖类抗原125(CA125)联合HPV DNA检测在宫颈癌早期筛查中的价值及病理特征。方法选取2019年8月至2023年6月沧州市中心医院收治的宫颈癌患者152例为观察组,另选取同期在本院行体检且各项正常女... 目的分析血清细胞角蛋白19片段(CYFRA21-1)、糖类抗原125(CA125)联合HPV DNA检测在宫颈癌早期筛查中的价值及病理特征。方法选取2019年8月至2023年6月沧州市中心医院收治的宫颈癌患者152例为观察组,另选取同期在本院行体检且各项正常女性80名为对照组;对比两组血清CYFRA21-1、CA125水平以及HPV DNA检测结果;对比观察组不同手术病理结果及血清CYFRA21-1、CA125表达水平以及HPV DNA检测结果;以病理学检查为金标准,分析血清CYFRA21-1、CA125水平以及HPV DNA检测单独以及联合诊断宫颈癌的一致性;绘制ROC曲线,分析血清CYFRA21-1、CA125联合HPV DNA单独检测及联合检测宫颈癌的效能。结果152例患者中,鳞状细胞癌104例,腺癌患者48例;其中轻度不典型增生66例、中度不典型增生57例、重度不典型增生29例。观察组血清CYFRA21-1、CA125水平以及HPV DNA阳性率均高于对照组,差异有统计学意义(P<0.05);血清CYFRA21-1、CA125水平:鳞状细胞癌<腺癌,轻度不典型增生<中度不典型增生<重度不典型增生,差异均有统计学意义(P<0.05)。观察组不同分期、不同肿瘤增生类型的HPV DNA阳性率比较,差异无统计学意义(P>0.05);血清CYFRA21-1、CA125水平、HPV DNA检测单独以及联合诊断宫颈癌与病理学检查结果的一致性Kappa值分别为0.677、0.731、0.756、0.902;CA125+CYFRA21-1+HPV DNA联合检测的AUC为0.894,高于CA125、CYFRA21-1、HPV DNA单独检测(P>0.05)。结论血清CYFRA21-1、CA125联合HPV DNA检测的诊断效能高于单一检测,提示三指标联合检测可显著提高宫颈癌早期筛查的诊断价值,可为制定临床治疗方案提供参考资料。 展开更多
关键词 CYFRA21-1 CA125 HPV dna检测 宫颈癌
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氧化石墨烯-DNA纳米探针用于三磷酸腺苷的检测与药物递送
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作者 张越 梁蕊 +1 位作者 赵灿男 李春梅 《应用化学》 CAS CSCD 北大核心 2024年第1期118-127,共10页
癌细胞内三磷酸腺苷(ATP)浓度异常与肿瘤发生发展过程密切相关,因此,快速、准确地检测细胞内外ATP水平具有重要意义。盐酸阿霉素(DOX)是一种广泛使用的抗癌药物,能嵌入DNA碱基对,并通过抑制DNA复制和转录诱导细胞凋亡。氧化石墨烯(Graph... 癌细胞内三磷酸腺苷(ATP)浓度异常与肿瘤发生发展过程密切相关,因此,快速、准确地检测细胞内外ATP水平具有重要意义。盐酸阿霉素(DOX)是一种广泛使用的抗癌药物,能嵌入DNA碱基对,并通过抑制DNA复制和转录诱导细胞凋亡。氧化石墨烯(Graphene oxide, GO)由于具有毒性低、比表面积大和易功能化,可以有效、稳定地负载DNA纳米探针进入细胞等优点而被广泛应用。然而,复杂环境中的生物分子容易通过物理吸附竞争性结合到GO表面,导致假阳性信号。基于此,提出了一种新型的GO-DNA纳米探针,并将其应用于ATP的检测与抗癌药物DOX靶向递送。以ATP的核酸适配体与其互补链杂交形成双链DNA(dsDNA),并通过G-C碱基对负载DOX,利用互补链延伸的poly A序列吸附到GO表面构建了GO-dsDNA-DOX纳米探针,能极大程度地降低复杂环境中物理吸附引起的干扰,减少假阳性信号产生。ATP与适配体特异性结合会导致DOX释放,根据其荧光“off-on”实现ATP的定量分析,DOX荧光强度与ATP含量在0.08~8.0 mmol/L范围内呈现良好的线性关系,线性方程为IF=3.0897c+129.08,检测限(3σ/k)为0.059 mmol/L,且方法具有良好的选择性和抗干扰能力。细胞毒性及荧光成像结果表明,负载DOX的纳米探针在人乳腺癌细胞(MCF-7)内有明显的药物释放,显著诱导细胞凋亡。该研究建立了一种免修饰、简单和快速的ATP含量检测分析方法,并利用癌细胞内高浓度ATP实现靶向药物递送,降低了对正常细胞的毒副作用,为癌症的治疗提供了新思路。 展开更多
关键词 三磷酸腺苷 dna纳米探针 氧化石墨烯 荧光检测 盐酸阿霉素 药物递送
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DNA methylation detection methods used in colorectal cancer 被引量:2
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作者 Yu-Xia Zhan Guang-Hua Luo 《World Journal of Clinical Cases》 SCIE 2019年第19期2916-2929,共14页
Colorectal cancer(CRC)remains a major contributor to the number of cancerrelated deaths that occur annually worldwide.With the development of molecular biology methods,an increasing number of molecular biomarkers have... Colorectal cancer(CRC)remains a major contributor to the number of cancerrelated deaths that occur annually worldwide.With the development of molecular biology methods,an increasing number of molecular biomarkers have been identified and investigated.CRC is believed to result from an accumulation of epigenetic changes,and detecting aberrant DNA methylation patterns is useful for both the early diagnosis and prognosis of CRC.Numerous studies are focusing on the development of DNA methylation detection methods or DNA methylation panels.Thus,this review will discuss the commonly used techniques and technologies to evaluate DNA methylation,their merits and deficiencies as well as the prospects for new methods. 展开更多
关键词 COLORECTAL CANCER CANCER screening MARKER dna METHYLATION detection
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循环肿瘤DNA的检测技术及在癌症诊疗中的应用价值
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作者 张洁洁 牛春艳 +3 位作者 董莲华 杨怡 李会杰 杨靖亚 《生物化学与生物物理进展》 SCIE CAS CSCD 北大核心 2024年第2期345-354,共10页
循环肿瘤DNA(ctDNA)来源于肿瘤,能很好地反映肿瘤的基因信息,并且会随着肿瘤的进展发生相应的改变。近年来,ctDNA独特的能力备受人们关注并被广泛研究,本文在总结ctDNA的来源、性质和样品处理的基础上,对ctDNA的检测技术及在癌症诊疗中... 循环肿瘤DNA(ctDNA)来源于肿瘤,能很好地反映肿瘤的基因信息,并且会随着肿瘤的进展发生相应的改变。近年来,ctDNA独特的能力备受人们关注并被广泛研究,本文在总结ctDNA的来源、性质和样品处理的基础上,对ctDNA的检测技术及在癌症诊疗中的应用进行综述,阐述了ctDNA标准物质在二代测序中的作用及重要性,并指出ctDNA样品的收集、存储、定量检测以及数据分析等各个流程中建立统一标准及规范的迫切性。 展开更多
关键词 循环肿瘤dna 液体活检 检测技术 应用 生物标志物
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Development of a loop‑mediated isothermal amplification assay for detection of Austropeplea tomentosa from environmental water samples
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作者 Lily Tran Vignesh A.Rathinasamy Travis Beddoe 《Animal Diseases》 2023年第1期35-48,共14页
Lymnaeid snails are key intermediate hosts for the development and survival of Fasciola spp.,the causative agent of Fascioliasis which are economically important parasites infecting humans and livestock globally.The c... Lymnaeid snails are key intermediate hosts for the development and survival of Fasciola spp.,the causative agent of Fascioliasis which are economically important parasites infecting humans and livestock globally.The current control method for treating Fascioliasis is heavily reliant on anthelmintic drugs,particularly Triclabendazole(TCBZ)which has resulted in drug-resistant parasites and poses significant risk as there are no long-term efficacious alternatives available.Sustainable control measures at the farm level could include both parasite and snail control will play an important role in Fasciola spp.control and reduce the reliance on anthelmintic drugs.Implementation of such sustainable control measures requires effective identification of snails on the property however Lymnaeid snails are small and difficult to physically locate.Snail identification using an environmental DNA approach is a recent approach in which physically locating snails are not required.Austropeplea tomentosa,is the primary intermediate snail host for F.hepatica transmission in South-East Australia and we present an in-field loop-mediated isothermal amplification and water filtering method for the detection of A.tomentosa eDNA from water samples to improve current surveillance methods.This methodology is highly sensitive with a detection limit of 5×10^(−6)ng/μL,detected in<20 minutes,with cumulative sample preparation and amplification time under 1 hour.This proposed workflow could assist in monitoring areas to determine the risk of Fascioliasis infection and implement strategies to manage snail populations to ultimately reduce the risk of infection for humans and livestock. 展开更多
关键词 Fasciola spp. SNAIL Molecular detection dna diagnostics LAMP Environmental sampling Edna
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A nano-metallic-particles-based CMOS image sensor for DNA detection 被引量:1
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作者 何进 苏艳梅 +5 位作者 马玉涛 陈沁 王若楠 叶韵 马勇 梁海浪 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第7期416-421,共6页
In this paper we report on a study of the CMOS image sensor detection of DNA based on self-assembled nano- metallic particles, which are selectively deposited on the surface of the passive image sensor. The nano-metal... In this paper we report on a study of the CMOS image sensor detection of DNA based on self-assembled nano- metallic particles, which are selectively deposited on the surface of the passive image sensor. The nano-metallic particles effectively block the optical radiation in the visible spectrum of ordinary light source. When such a technical method is applied to DNA detection, the requirement for a special UV light source in the most popular fluorescence is eliminated. The DNA detection methodology is tested on a CMOS sensor chip fabricated using a standard 0.5 gm CMOS process. It is demonstrated that the approach is highly selective to detecting even a signal-base mismatched DNA target with an extremely-low-concentration DNA sample down to 10 pM under an ordinary light source. 展开更多
关键词 CMOS image sensor nano-metallic particles dna detection 0.5 gm CMOS process
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基于多靶点粪便FIT-DNA联合检测技术的结直肠癌早筛应用研究
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作者 王杰 侯明星 +4 位作者 程海东 刘永强 苗杰 李淑雯 陈璐 《肿瘤防治研究》 CAS 2024年第7期578-582,共5页
目的评价多靶点粪便FIT-DNA联合检测技术在结直肠癌早期筛查中的效果并进一步分析其应用前景。方法选取内蒙古医科大学附属医院就诊人群,每位受试者分别行血清肿瘤标志物检测、多靶点粪便FIT-DNA联合检测、肠镜检查,以接受多靶点粪便FIT... 目的评价多靶点粪便FIT-DNA联合检测技术在结直肠癌早期筛查中的效果并进一步分析其应用前景。方法选取内蒙古医科大学附属医院就诊人群,每位受试者分别行血清肿瘤标志物检测、多靶点粪便FIT-DNA联合检测、肠镜检查,以接受多靶点粪便FIT-DNA联合检测人群为实验组,以接受肠镜检查及血清肿瘤标志物检测人群为对照组,以病理结果为金标准,评价新型粪便分子检测技术对于结直肠癌筛查的效果,对筛出的阳性人群给予及时干预。结果共分析了115例患者。血清肿瘤标志物检测敏感度63.2%(43/68),特异度74.5%(35/47);肠镜检查敏感度97.1%(66/68),特异度80.7%(38/47);而多靶点粪便FIT-DNA联合检测敏感度89.7%(61/68),特异度87.2%(41/47)。多靶点粪便FIT-DNA联合检测敏感度、特异度等均优于血清肿瘤标志物检测,敏感度虽低于肠镜检查,但相较肠镜检查操作简单,可居家自测。 展开更多
关键词 多靶点粪便FIT-dna联合检测 血清肿瘤标志物 结直肠癌 早筛 肠镜检查
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Detection of DNA Bases Using Fe Atoms and Graphene 被引量:1
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作者 胡建芬 冯琳 +2 位作者 张文星 李勇 卢亚鑫 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第1期123-126,共4页
The adsorption of DNA bases on a magnetic probe composed of Fe atoms and graphene is studied by using first- principles calculations. The stability of geometry, the electronic structure and magnetic property are inves... The adsorption of DNA bases on a magnetic probe composed of Fe atoms and graphene is studied by using first- principles calculations. The stability of geometry, the electronic structure and magnetic property are investigated. The results indicate that four DNA bases, i.e., adenine, thymine, cytosine and guanine, can all be adsorbed on the probe solidly. However, the magnetic moments of the composite structure can be observed only when adenine adsorbs on the probe. In the cases of the adsorption of the other three bases, the magnetic moments of the composite structure are zero. Based on the significant change of magnetic moment of the composite structure, adenine can be distinguished conveniently from thymine, cytosine and guanine. This work may provide a new way to detect DNA bases. 展开更多
关键词 of on as in FE detection of dna Bases Using Fe Atoms and Graphene that dna IS
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雅鲁藏布江中游拉萨裸裂尻鱼环境DNA检测及生物量评估
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作者 李冰 冯秀 +3 位作者 朱仁 隋晓云 贾银涛 陈毅峰 《水生态学杂志》 CSCD 北大核心 2024年第2期84-91,共8页
建立快速和准确的环境DNA(eDNA)检测方法,可为鱼类的长期监测提供便利,为鱼类资源保护和管理提供技术支撑。2019年在雅鲁藏布江中游干流及拉鲁湿地和茶巴朗湿地采集了20种鱼和水样,针对拉萨裸裂尻鱼(Schizopygopsis younghusbandi young... 建立快速和准确的环境DNA(eDNA)检测方法,可为鱼类的长期监测提供便利,为鱼类资源保护和管理提供技术支撑。2019年在雅鲁藏布江中游干流及拉鲁湿地和茶巴朗湿地采集了20种鱼和水样,针对拉萨裸裂尻鱼(Schizopygopsis younghusbandi younghusbandi)设计Cytb基因的特异性引物和探针,利用微滴式数字PCR(ddPCR)检测水样中e DNA拷贝数,并分析其与生物量和丰度之间的相关性。结果显示,正反向引物及探针序列与其他19种鱼之间的平均错配碱基数分别为6.8、6.9和3.6,且对其基因组DNA进行ddPCR扩增没有荧光信号。通过对比ddPCR和网捕2种方法,70%样点中检测结果相同,剩余30%样点都是网捕未捕获但ddPCR检出的情况。在拉鲁湿地和雅鲁藏布江干流的样点中,水样eDNA拷贝数与拉萨裸裂尻鱼生物量和丰度之间均具有显著的相关性,拉鲁湿地水样e DNA与二者的相关系数分别为0.987和0.647,雅鲁藏布江水样eDNA与二者的相关系数分别为0.786和0.756,表明eDNA技术是鱼类分布和生物量监测的有效方法。eDNA检测易受到近缘物种和水体理化性质的影响。 展开更多
关键词 环境dna 微滴式数字PCR 拉萨裸裂尻鱼 物种检测 雅鲁藏布江中游
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Abnormal DNA methylation as a cell-free circulating DNA biomarker for colorectal cancer detection:A review of literature 被引量:2
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作者 Michail Galanopoulos Nikolaos Tsoukalas +3 位作者 Ioannis S Papanikolaou Maria Tolia Maria Gazouli Gerassimos J Mantzaris 《World Journal of Gastrointestinal Oncology》 SCIE CAS 2017年第4期142-152,共11页
Colorectal cancer(CRC) is one of the most prevalent malignancies in the world. CRC-associated morbidity and mortality is continuously increasing, in part due to a lack of early detection. The existing screening tools ... Colorectal cancer(CRC) is one of the most prevalent malignancies in the world. CRC-associated morbidity and mortality is continuously increasing, in part due to a lack of early detection. The existing screening tools such as colonoscopy, are invasive and yet high cost, affecting the willingness of patients to participate in screening programs. In recent years, evidence is accumulating that the interaction of aberrant genetic and epigenetic modifications is the cornerstone for the CRC development and progression by alternating the function of tumor suppressor genes, DNA repair genes and oncogenes of colonic cells. Apart from the understanding of the underlying mechanism(s) of carcinogenesis, the aforementioned interaction has also allowed identification of clinical biomarkers, especially epigenetic, for the early detection and prognosis of cancer patients. One of the ways to detect these epigenetic biomarkers is the cell-free circulating DNA(circ DNA), a blood-based cancer diagnostic test, mainly focusing in the molecular alterations found in tumor cells, such as DNA mutations and DNA methylation.In this brief review, we epitomize the current knowledge on the research in circ DNA biomarkers-mainly focusing on DNA methylation-as potential blood-based tests for early detection of colorectal cancer and the challenges for validation and globally implementation of this emergent technology. 展开更多
关键词 Colorectal cancer early detection Colorectal cancer screening Circulating free dna Colorectal cancer blood-based biomarkers dna methylation blood biomarkers
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Development and evaluation of a DNA microarray assay for the simultaneous detection of nine harmful algal species in ship ballast and seaport waters 被引量:1
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作者 陈先锋 周前进 +6 位作者 段维军 周成旭 段丽君 张慧丽 孙爱丽 严小军 陈炯 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2016年第1期86-101,共16页
Rapid,high-throughput and reliable methods are urgently required to accurately detect and monitor harmful algae,which are responsible for algal blooms,such as red and green tides. In this study,we successfully develop... Rapid,high-throughput and reliable methods are urgently required to accurately detect and monitor harmful algae,which are responsible for algal blooms,such as red and green tides. In this study,we successfully developed a multiplex PCR-based DNA microarray method capable of detecting nine harmful algal species simultaneously,namely A lexandrium tamarense,Gyrodinium instriatum,Heterosigma akashiwo,Karenia mikimotoi,Prorocentrum donghaiense,Prorocentrum minimum,Ulva compressa,Ulva ohnoi and Ulva prolifera. This method achieved a limit of detection(LOD) of 0.5 ng of genomic DNA(orders of magnitude of the deci-nanogram range) in the tested algae cultures. Altogether,230 field samples from ship ballast waters and seaport waters were used to evaluate the DNA microarray. The clinical sensitivity and specificity of the DNA microarray assay in detecting field samples were 96.4% and 90.9%,respectively,relative to conventional morphological methods. This indicated that this high-throughput,automatic,and specific method is well suited for the detection of algae in water samples. 展开更多
关键词 ballast waters dna microarray harmful algae limit of detection multiplex PCR seaport waters
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Robust and efficient direct multiplex amplification method for large-scale DNA detection of blood samples on FTA cards 被引量:3
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作者 JIANG Bowei XIANG Fawei +2 位作者 ZHAO Xingchun WANG Lihua FAN Chunhai 《Nuclear Science and Techniques》 SCIE CAS CSCD 2013年第3期72-80,共9页
Deoxyribonucleic acid (DNA) damage arising from radiations widely occurred along with the development of nuclear weapons and clinically wide application of computed tomography (CT) scan and nuclear medicine. All ioniz... Deoxyribonucleic acid (DNA) damage arising from radiations widely occurred along with the development of nuclear weapons and clinically wide application of computed tomography (CT) scan and nuclear medicine. All ionizing radiations (X-rays, γ-rays, alpha particles, etc.) and ultraviolet (UV) radiation lead to the DNA damage. Polymerase chain reaction (PCR) is one of the most wildly used techniques for detecting DNA damage as the amplification stops at the site of the damage. Improvements to enhance the efficiency of PCR are always required and remain a great challenge. Here we establish a multiplex PCR assay system (MPAS) that is served as a robust and efficient method for direct detection of target DNA sequences in genomic DNA. The establishment of the system is performed by adding a combination of PCR enhancers to standard PCR buffer. The performance of MPAS was demonstrated by carrying out the direct PCR amplification on 1.2 mm human blood punch using commercially available primer sets which include multiple primer pairs. The optimized PCR system resulted in high quality genotyping results without any inhibitory effect indicated and led to a full-profile success rate of 98.13%. Our studies demonstrate that the MPAS provides an efficient and robust method for obtaining sensitive, reliable and reproducible PCR results from human blood samples. 展开更多
关键词 dna检测 血液样本 计算机断层扫描 FTA 多重PCR dna损伤 稳健 脱氧核糖核酸
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Early detection of circulating tumor DNA and successful treatment with osimertinib in thr790met-positive leptomeningeal metastatic lung cancer:A case report 被引量:1
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作者 Li-Qing Xu Ying-Jin Wang +2 位作者 Sheng-Li Shen Yao Wu Hong-Zhou Duan 《World Journal of Clinical Cases》 SCIE 2022年第22期7968-7972,共5页
BACKGROUND Patients diagnosed with non-small-cell lung cancer with activated epidermal growth factor receptor mutations are more likely to develop leptomeningeal(LM)metastasis than other types of lung cancers and have... BACKGROUND Patients diagnosed with non-small-cell lung cancer with activated epidermal growth factor receptor mutations are more likely to develop leptomeningeal(LM)metastasis than other types of lung cancers and have a poor prognosis.Early diagnosis and effective treatment of leptomeningeal carcinoma can improve the prognosis.CASE SUMMARY A 55-year-old female with a progressive headache and vomiting for one month was admitted to Peking University First Hospital.She was diagnosed with lung adenocarcinoma with osseous metastasis 10 months prior to admittance.epidermal growth factor receptor(EGFR)mutation was detected by genomic examination,so she was first treated with gefitinib for 10 months before acquiring resistance.Cell-free cerebrospinal fluid(CSF)circulating tumor DNA detection by next-generation sequencing was conducted and indicated the EGFR-Thr790Met mutation,while biopsy and cytology from the patient’s CSF and the first enhanced cranial magnetic resonance imaging(MRI)showed no positive findings.A month later,the enhanced MRI showed linear leptomeningeal enhancement,and the cytology and biochemical examination in CSF remained negative.Therefore,osimertinib(80 mg/d)was initiated as a second-line treatment,resulting in a good response within a month.CONCLUSION This report suggests clinical benefit of osimertinib in LM patients with positive detection of the EGFR-Thr790Met mutation in CSF and proposes that the positive findings of CSF circulating tumor DNA as a liquid biopsy technology based on the detection of cancer-associated gene mutations may appear earlier than the imaging and CSF findings and may thus be helpful for therapy.Moreover,the routine screening of chest CT with the novel coronavirus may provide unexpected benefits。 展开更多
关键词 Non-small cell lung cancer Epidermal growth factor receptor mutation Circulating tumor dna detection Leptomeningeal carcinomatosis Osimertinib Case report
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Non-invasive Prenatal Gene Diagnosis: Progress through Cell-free Fetal DNA and RNA in Maternal Plasma and Urine
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作者 GUO Xun-yang, GUO Yi-bin ( Department of Medical Genetics, Zhongshan School of Medicine, SUN Yat-Sen University, Guangzhou 510080, China ) 《中山大学学报(医学科学版)》 CAS CSCD 北大核心 2008年第S2期140-142,共3页
Non-invasive prenatal gene diagnosis has been developed rapidly in the recent years, and numerous medical researchers are focusing on it. Such techniques could not only achieve prenatal diagnosis accurately, but also ... Non-invasive prenatal gene diagnosis has been developed rapidly in the recent years, and numerous medical researchers are focusing on it. Such techniques could not only achieve prenatal diagnosis accurately, but also prevent tangential illness in fetuses and thus, reduce the incidence of diseases. Moreover, it is non-invasive prenatal gene diagnosis that prevents potential threaten and danger to both mothers and fetuses. Therefore, it is welcomed by clinical gynecologist and obstetrian, researchers of medical genetics, and especially, pregnancies. This review article touches briefly on the advanced development of using cell-free DNA, RNA in maternal plasma and urine for non-invasive prenatal gene diagnosis. 展开更多
关键词 non-invasive prenatal gene diagnosis CELL-FREE fetal dna and RNA dna and RNA detection MATERNAL URINE MATERNAL plasma
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基于纳米孔读取的DNA存储发展与展望 被引量:1
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作者 林艺生 武瑞君 +1 位作者 钱珑 张成 《集成技术》 2024年第3期54-73,共20页
现代社会正处于数据爆炸的时代,全球对数据存储的需求已经远远超过了已有的存储能力。DNA是一种天然的遗传信息载体,可实现稳定、高效、低功耗的数据存储。目前的DNA存储过程主要分为6个环节:编码、写入、保存、检索、读取、解码。纳米... 现代社会正处于数据爆炸的时代,全球对数据存储的需求已经远远超过了已有的存储能力。DNA是一种天然的遗传信息载体,可实现稳定、高效、低功耗的数据存储。目前的DNA存储过程主要分为6个环节:编码、写入、保存、检索、读取、解码。纳米孔测序技术被广泛应用于读取DNA中所存储的信息。该文系统性地介绍了纳米孔分子检测技术的原理和发展历史,及其在DNA存储中的应用。此外,该文总结了机器学习在纳米孔检测技术中的应用,着重介绍了结合机器学习的新型纳米孔检测技术。该文为纳米孔检测技术的发展提供了新方向,也为新型实用化DNA存储系统的发展奠定了基础。 展开更多
关键词 纳米孔测序 纳米孔检测 dna存储 机器学习
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DNA Separation by Capillary Electrophoresis with Ultraviolet Detection using Mixed Synthetic Polymers
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作者 Qian WANG Xu XU 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第12期1278-1280,共3页
The mixtures of two polymers, poly (N,N-dimethylacrylamide) (PDMA) and polyvinylpyrrolidone (PVP) were synthesized and used as the separation medium for double-stranded and single-stranded DNA fragments by capillary e... The mixtures of two polymers, poly (N,N-dimethylacrylamide) (PDMA) and polyvinylpyrrolidone (PVP) were synthesized and used as the separation medium for double-stranded and single-stranded DNA fragments by capillary electrophoresis with UV detector. On optimal conditions, 2%w/v PDMA + 2%w/v PVP can be used to separate the doublet 123/124bp in pBR322/Hae III Markers. 展开更多
关键词 Synthetic polymer dna separation capillary electrophoresis ultraviolet detection.
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乙肝患者HBV-DNA载量与血清标志物水平的相关性及其对抗病毒疗效的预测价值
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作者 隋娟 钟芳芳 郑秀霞 《中国民康医学》 2024年第10期148-150,154,共4页
目的:观察乙型肝炎(简称乙肝)患者HBV-DNA载量与血清标志物[乙肝表面抗原(HBsAg)、乙肝病毒e抗原(HBeAg)、乙肝病毒核心抗体(HBcAb)、HBcAb-免疫球蛋白M(IgM)]水平的相关性及其对抗病毒疗效的预测价值。方法:选取2020年7月至2022年7月... 目的:观察乙型肝炎(简称乙肝)患者HBV-DNA载量与血清标志物[乙肝表面抗原(HBsAg)、乙肝病毒e抗原(HBeAg)、乙肝病毒核心抗体(HBcAb)、HBcAb-免疫球蛋白M(IgM)]水平的相关性及其对抗病毒疗效的预测价值。方法:选取2020年7月至2022年7月该院收治的154例乙肝患者进行前瞻性研究,测定其入院时、抗病毒治疗1个月后HBV-DNA载量与血清标志物水平。采用Pearson相关性分析,分析乙肝患者入院时HBV-DNA载量与血清标志物水平的相关性;比较抗病毒治疗6个月不同疗效患者抗病毒治疗1个月时HBV-DNA载量与血清标志物水平;采用受试者工作特征(ROC)曲线分析抗病毒治疗1个月HBV-DNA载量与血清标志物水平单项及联合检测对抗病毒治疗6个月后疗效的预测价值。结果:Pearson相关性分析结果显示,入院时,乙肝患者HBVDNA载量与血清HBsAg、HBeAg、HBcAb、HBcAb-IgM水平均呈正相关(r>0,P<0.05);抗病毒治疗6个月后完全应答患者治疗1个月时HBV-DNA载量和血清HBsAg、HBeAg、HBcAb、HBcAb-IgM水平均低于未完全应答患者,差异有统计学意义(P<0.05);ROC曲线分析结果显示,乙肝患者抗病毒治疗1个月后HBV-DNA载量与血清HBsAg、HBeAg、HBcAb、HBcAb-IgM水平联合检测对抗病毒治疗6个月后的疗效预测价值[曲线下面积(AUC)=0.905]高于五者单项检测(AUC=0.779、0.802、0.792、0.739、0.831)。结论:乙肝患者HBV-DNA载量与血清HBsAg、HBeAg、HBcAb、HBcAb-IgM水平均呈正相关,且乙肝患者抗病毒治疗1个月后HBV-DNA载量与血清HBsAg、HBeAg、HBcAb、HBcAb-IgM水平联合检测对抗病毒治疗6个月后的疗效预测价值高于五者单项检测。 展开更多
关键词 HBV-dna载量 血清标志物 抗病毒疗效 检测 预测 价值
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A novel detection of single-stranded DNA binding protein based on ss-DNA modified chip using surface plasmon resonance microscopy
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作者 Jian Quan Lu Ming Bo Xu +2 位作者 Xing Wang Zhou Jin Guang Xu Qing Tao 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第4期441-444,共4页
An ss-DNA gold chip was prepared based on self-assembly of the thiol-derivatized oligonucleotide, and used for the determination of single-stranded binding protein (SSB) by surface plasmon resonance microscopy (SPR... An ss-DNA gold chip was prepared based on self-assembly of the thiol-derivatized oligonucleotide, and used for the determination of single-stranded binding protein (SSB) by surface plasmon resonance microscopy (SPR). The experiment results showed that SSB binds ss-DNA with high specificity, and relative signal of SPR response is proportional to the concentration of SSB in the range of 0.1-100 ng/mL with a detection limit (S/N = 3) of 0.07 ng/mL. 展开更多
关键词 detection Single-stranded dna binding protein ss-dna Surface plasmon resonance microscopy
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